Predicting molecular structures, experimental frame structure, the tetrahedron, methane, hexagon, CH, equivalent, benzene, linear

In all of chemistry textbooks for secondary schools, these structures are determined based on experimental studies. Tetrahedral framework structure such as in methane, and water triangle at the hexagon with six equivalent CH bonds that form benzene, all very interesting.

Why methane does not form a cross structure? Why water is not linear? Why benzene CC bonds and also has a CH bond length of all the same? Such questions can be answered by quantum chemistry. Bond length and angles can be obtained by quantum chemical calculations.

The molecular structure is the arrangement of atoms in a molecule of three-dimensional space. Study the molecular structure in chemistry plays a very important due to the molecular structure determines the chemical properties of a molecule.

Experimental results showed that the property section (bf/2tf, h / bf), a high ratio of column structures with a high-profile (H / h), and a high column width of structure (H / L) is a very influential parameter on ductility . Validation of the proposed formula ductility through numerical studies show that the numerical results are more conservative, but the results of numerical analysis and experiments showed the same pattern of ductility curve.

Frame structure is the earliest known structure on tall buildings. This structure emerged since the advent of steel and reinforced concrete construction. Even now, this structure is widely used to establish high bangunana structure. Rigid frame system is generally in the form of regular square grid composed of horizontal beams and vertical columns connected by a field by using a rigid connection.

Tetrahedron API In subsequent developments, it was found that in addition to the three components as mentioned in the triangle there is another component of the fourth fire in the combustion process required by the combustion process to support the continuity and also to increase in size, ie the chain of chemical reactions between the fuel with oxidizing materials / oxidant .

Methane is the simplest form of hydrocarbon gases with chemical formula of CH4. Pure methane is odorless, but if used for commercial purposes, usually add a little sulfur smell to detect leaks that may occur.

Natural gas, methane is the primary fuel source. Burning one molecule of methane with oxygen releases one molecule of CO2 (carbon dioxide) and two molecules of H2O (water): CH4 + 2o2 → CO2 + 2H2O.

Hexagon is a geometric shape is most suitable to take advantage of each area of the unit as a maximum ". If the honeycomb cells built with other forms, there will be an unused area, so less honey that can be stored and fewer bees who get the benefit.

Molecular formula of methyl propanoate is CH3CH2COOCH3. Hydrogen in the CH2 groups clearly are on a different chemical environment of the CH3 groups. Two CH3 groups has a different chemical environment. The one attached to the CH2 and the other groups attached to oxygen.

Equivalent weight is the weight of one equivalent of a substance in grams

Benzene is a toxin that attacks the liver, kidneys, lungs, heart and brain and can cause damage kromosonal. Said someone is currently conducted research on the effect of benzene on the level of fertility of men and women. After the new research may we know what the effect of benzene on the level of fertility of men and women.

Linear functions are functions of the simplest because it only has one independent variable and the rank one on independent variables, so often referred to as a function berderajad one. The general form of linear equation is: y = a + bx, where a is constant and b is the coefficient (b? 0). Or often expressed in implicit form
follows: Ax + By + C = 0. While the Settlement of a system of linear equations is a set of values that satisfy simultaneously (simultaneously) all the equations from the system. Or simply the completion of the system of linear equations is to determine the intersection of two linear equations. There are three ways that can be used for the completion of a system of linear equations, namely: (1). Substitution Method, (2). Elimination Methods, and (3). The determinant method. And for the last linear algebra is the field of mathematics that studies the system of linear equations and solutions, vectors, and linear transformation. Matrix and its operation is also closely related to the field of linear algebra.